Using a browser with a built-in spell checker, when you fill in a form or message box on the web, including posting to forums, the browser's spell checker is in effect. They are very easy to use and can "learn" spellings. Usually you just right-click on a word that's highlighted as mis-spelled for options.

*There are several options to add a spell checker to IE. A Google search will turn up many of them. Here are a few (in no particular order):

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